Abstract

This paper reports an electrically tunable plasmonic crystal incorporating a nematic liquid crystal (LC) layer on the top surface of quasi-3-D mushroom plasmonic nanostructures. The presented plasmonic crystal is formed by an array of polymeric mushroom nanoposts with gold disks at the top and perforated nanoholes in a gold thin film at the bottom. The coupling between surface plasmon polariton (SPP) and Rayleigh anomaly (RA) is observed in experiments with quasi-3-D plasmonic crystals, and verified by simulations. The coupled SPP-RA resonance mode has its electric field vector prominently normal to the surface of the plasmonic nanostructures, and extends into the surrounding medium. This feature makes the coupled resonance sensitive to molecular reorientation in LC, and thus, is useful for designing index modulation-based tunable plasmonic crystal devices. Therefore, by applying external voltages across the LC layer, the SPP-RA resonance mode shows a redshift of 8 nm with a 35% change in the amplitude.

© 2016 IEEE

Investigation of a quasi-3D plasmonic nanostructure for TE and TM polarizations

Afsaneh Shahmansouri and Bizhan Rashidian
J. Opt. Soc. Am. B 31(11) 2838-2844 (2014)

Understanding the effects of dielectric medium, substrate, and depth on electric fields and SERS of quasi-3D plasmonic nanostructures

Jiajie Xu, Pavel Kvasnička, Matthew Idso, Roger W. Jordan, Heng Gong, Jiří Homola, and Qiuming Yu
Opt. Express 19(21) 20493-20505 (2011)

Plasmonic nanohole electrodes for active color tunable liquid crystal transmissive pixels

Richard Bartholomew, Calum Williams, Ammar Khan, Richard Bowman, and Timothy Wilkinson
Opt. Lett. 42(14) 2810-2813 (2017)

Aluminum-based quasi-3D self-aligning plasmonic metasurface with an attenuated substrate effect for high-sensitivity sensing

Yuhang Huang, Yuzhang Liang, Lanlan Shen, Rui Li, Cheng Yang, and Wei Peng
J. Opt. Soc. Am. B 41(3) 756-760 (2024)

Surface plasmon polariton beams from an electrically excited plasmonic crystal

Damien Canneson, Eric Le Moal, Shuiyan Cao, Xavier Quélin, Hervé Dallaporta, Gérald Dujardin, and Elizabeth Boer-Duchemin
Opt. Express 24(23) 26186-26200 (2016)